ClabureDB: Classified Bug-Reports Database

   /*
    * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
    *
    *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
    *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
    *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
    *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
    *                          - Added processor hotplug support
    *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or (at
   *  your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful, but
   *  WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   *  General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
   *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *  TBD:
   *        1. Make # power states dynamic.
   *        2. Support duty_cycle values that span bit 4.
   *        3. Optimize by having scheduler determine business instead of
   *           having us try to calculate it here.
   *        4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/pci.h>
  #include <linux/pm.h>
  #include <linux/cpufreq.h>
  #include <linux/cpu.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include <linux/dmi.h>
  #include <linux/moduleparam.h>
  #include <linux/cpuidle.h>
  
  #include <asm/io.h>
  #include <asm/system.h>
  #include <asm/cpu.h>
  #include <asm/delay.h>
  #include <asm/uaccess.h>
  #include <asm/processor.h>
  #include <asm/smp.h>
  #include <asm/acpi.h>
  
  #include <acpi/acpi_bus.h>
  #include <acpi/acpi_drivers.h>
  #include <acpi/processor.h>
  
  #define ACPI_PROCESSOR_CLASS                "processor"
  #define ACPI_PROCESSOR_DEVICE_NAME        "Processor"
  #define ACPI_PROCESSOR_FILE_INFO        "info"
  #define ACPI_PROCESSOR_FILE_THROTTLING        "throttling"
  #define ACPI_PROCESSOR_FILE_LIMIT        "limit"
  #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
  #define ACPI_PROCESSOR_NOTIFY_POWER        0x81
  #define ACPI_PROCESSOR_NOTIFY_THROTTLING        0x82
  
  #define ACPI_PROCESSOR_LIMIT_USER        0
  #define ACPI_PROCESSOR_LIMIT_THERMAL        1
  
  #define _COMPONENT                ACPI_PROCESSOR_COMPONENT
  ACPI_MODULE_NAME("processor_core");
  
  MODULE_AUTHOR("Paul Diefenbaugh");
  MODULE_DESCRIPTION("ACPI Processor Driver");
  MODULE_LICENSE("GPL");
  
  static int acpi_processor_add(struct acpi_device *device);
  static int acpi_processor_start(struct acpi_device *device);
  static int acpi_processor_remove(struct acpi_device *device, int type);
  static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
  static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
  static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
  static int acpi_processor_handle_eject(struct acpi_processor *pr);
  
  
  static const struct acpi_device_id processor_device_ids[] = {
          {ACPI_PROCESSOR_OBJECT_HID, 0},
          {ACPI_PROCESSOR_HID, 0},
          {"", 0},
  };
  MODULE_DEVICE_TABLE(acpi, processor_device_ids);
  
  static struct acpi_driver acpi_processor_driver = {
          .name = "processor",
          .class = ACPI_PROCESSOR_CLASS,
         .ids = processor_device_ids,
         .ops = {
                 .add = acpi_processor_add,
                 .remove = acpi_processor_remove,
                 .start = acpi_processor_start,
                 .suspend = acpi_processor_suspend,
                 .resume = acpi_processor_resume,
                 },
 };
 
 #define INSTALL_NOTIFY_HANDLER                1
 #define UNINSTALL_NOTIFY_HANDLER        2
 
 static const struct file_operations acpi_processor_info_fops = {
         .owner = THIS_MODULE,
         .open = acpi_processor_info_open_fs,
         .read = seq_read,
         .llseek = seq_lseek,
         .release = single_release,
 };
 
 DEFINE_PER_CPU(struct acpi_processor *, processors);
 struct acpi_processor_errata errata __read_mostly;
 static int set_no_mwait(const struct dmi_system_id *id)
 {
         printk(KERN_NOTICE PREFIX "%s detected - "
                 "disabling mwait for CPU C-states\n", id->ident);
         idle_nomwait = 1;
         return 0;
 }
 
 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
         {
         set_no_mwait, "IFL91 board", {
         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
         {
         set_no_mwait, "Extensa 5220", {
         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
         {},
 };
 
 /* --------------------------------------------------------------------------
                                 Errata Handling
    -------------------------------------------------------------------------- */
 
 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 {
         u8 value1 = 0;
         u8 value2 = 0;
 
 
         if (!dev)
                 return -EINVAL;
 
         /*
          * Note that 'dev' references the PIIX4 ACPI Controller.
          */
 
         switch (dev->revision) {
         case 0:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
                 break;
         case 1:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
                 break;
         case 2:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
                 break;
         case 3:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
                 break;
         default:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
                 break;
         }
 
         switch (dev->revision) {
 
         case 0:                /* PIIX4 A-step */
         case 1:                /* PIIX4 B-step */
                 /*
                  * See specification changes #13 ("Manual Throttle Duty Cycle")
                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
                  * erratum #5 ("STPCLK# Deassertion Time") from the January
                  * 2002 PIIX4 specification update.  Applies to only older
                  * PIIX4 models.
                  */
                 errata.piix4.throttle = 1;
 
         case 2:                /* PIIX4E */
         case 3:                /* PIIX4M */
                 /*
                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
                  * Livelock") from the January 2002 PIIX4 specification update.
                  * Applies to all PIIX4 models.
                  */
 
                 /*
                  * BM-IDE
                  * ------
                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
                  * Status register address.  We'll use this later to read
                  * each IDE controller's DMA status to make sure we catch all
                  * DMA activity.
                  */
                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
                                      PCI_DEVICE_ID_INTEL_82371AB,
                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
                 if (dev) {
                         errata.piix4.bmisx = pci_resource_start(dev, 4);
                         pci_dev_put(dev);
                 }
 
                 /*
                  * Type-F DMA
                  * ----------
                  * Find the PIIX4 ISA Controller and read the Motherboard
                  * DMA controller's status to see if Type-F (Fast) DMA mode
                  * is enabled (bit 7) on either channel.  Note that we'll
                  * disable C3 support if this is enabled, as some legacy
                  * devices won't operate well if fast DMA is disabled.
                  */
                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
                                      PCI_DEVICE_ID_INTEL_82371AB_0,
                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
                 if (dev) {
                         pci_read_config_byte(dev, 0x76, &value1);
                         pci_read_config_byte(dev, 0x77, &value2);
                         if ((value1 & 0x80) || (value2 & 0x80))
                                 errata.piix4.fdma = 1;
                         pci_dev_put(dev);
                 }
 
                 break;
         }
 
         if (errata.piix4.bmisx)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
         if (errata.piix4.fdma)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
 
         return 0;
 }
 
 static int acpi_processor_errata(struct acpi_processor *pr)
 {
         int result = 0;
         struct pci_dev *dev = NULL;
 
 
         if (!pr)
                 return -EINVAL;
 
         /*
          * PIIX4
          */
         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
                              PCI_ANY_ID, NULL);
         if (dev) {
                 result = acpi_processor_errata_piix4(dev);
                 pci_dev_put(dev);
         }
 
         return result;
 }
 
 /* --------------------------------------------------------------------------
                               Common ACPI processor functions
    -------------------------------------------------------------------------- */
 
 /*
  * _PDC is required for a BIOS-OS handshake for most of the newer
  * ACPI processor features.
  */
 static int acpi_processor_set_pdc(struct acpi_processor *pr)
 {
         struct acpi_object_list *pdc_in = pr->pdc;
         acpi_status status = AE_OK;
 
 
         if (!pdc_in)
                 return status;
         if (idle_nomwait) {
                 /*
                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
                  * mode will be disabled in the parameter of _PDC object.
                  * Of course C1_FFH access mode will also be disabled.
                  */
                 union acpi_object *obj;
                 u32 *buffer = NULL;
 
                 obj = pdc_in->pointer;
                 buffer = (u32 *)(obj->buffer.pointer);
                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 
         }
         status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 
         if (ACPI_FAILURE(status))
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                     "Could not evaluate _PDC, using legacy perf. control...\n"));
 
         return status;
 }
 
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
 
 static struct proc_dir_entry *acpi_processor_dir = NULL;
 
 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
 {
         struct acpi_processor *pr = seq->private;
 
 
         if (!pr)
                 goto end;
 
         seq_printf(seq, "processor id:            %d\n"
                    "acpi id:                 %d\n"
                    "bus mastering control:   %s\n"
                    "power management:        %s\n"
                    "throttling control:      %s\n"
                    "limit interface:         %s\n",
                    pr->id,
                    pr->acpi_id,
                    pr->flags.bm_control ? "yes" : "no",
                    pr->flags.power ? "yes" : "no",
                    pr->flags.throttling ? "yes" : "no",
                    pr->flags.limit ? "yes" : "no");
 
       end:
         return 0;
 }
 
 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
 {
         return single_open(file, acpi_processor_info_seq_show,
                            PDE(inode)->data);
 }
 
 static int acpi_processor_add_fs(struct acpi_device *device)
 {
         struct proc_dir_entry *entry = NULL;
 
 
         if (!acpi_device_dir(device)) {
                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                                                      acpi_processor_dir);
                 if (!acpi_device_dir(device))
                         return -ENODEV;
         }
         acpi_device_dir(device)->owner = THIS_MODULE;
 
         /* 'info' [R] */
         entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
                                  S_IRUGO, acpi_device_dir(device),
                                  &acpi_processor_info_fops,
                                  acpi_driver_data(device));
         if (!entry)
                 return -EIO;
 
         /* 'throttling' [R/W] */
         entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
                                  S_IFREG | S_IRUGO | S_IWUSR,
                                  acpi_device_dir(device),
                                  &acpi_processor_throttling_fops,
                                  acpi_driver_data(device));
         if (!entry)
                 return -EIO;
 
         /* 'limit' [R/W] */
         entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
                                  S_IFREG | S_IRUGO | S_IWUSR,
                                  acpi_device_dir(device),
                                  &acpi_processor_limit_fops,
                                  acpi_driver_data(device));
         if (!entry)
                 return -EIO;
         return 0;
 }
 
 static int acpi_processor_remove_fs(struct acpi_device *device)
 {
 
         if (acpi_device_dir(device)) {
                 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
                                   acpi_device_dir(device));
                 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
                                   acpi_device_dir(device));
                 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
                                   acpi_device_dir(device));
                 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
                 acpi_device_dir(device) = NULL;
         }
 
         return 0;
 }
 
 /* Use the acpiid in MADT to map cpus in case of SMP */
 
 #ifndef CONFIG_SMP
 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
 #else
 
 static struct acpi_table_madt *madt;
 
 static int map_lapic_id(struct acpi_subtable_header *entry,
                  u32 acpi_id, int *apic_id)
 {
         struct acpi_madt_local_apic *lapic =
                 (struct acpi_madt_local_apic *)entry;
         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
             lapic->processor_id == acpi_id) {
                 *apic_id = lapic->id;
                 return 1;
         }
         return 0;
 }
 
 static int map_lsapic_id(struct acpi_subtable_header *entry,
                 int device_declaration, u32 acpi_id, int *apic_id)
 {
         struct acpi_madt_local_sapic *lsapic =
                 (struct acpi_madt_local_sapic *)entry;
         u32 tmp = (lsapic->id << 8) | lsapic->eid;
 
         /* Only check enabled APICs*/
         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
                 return 0;
 
         /* Device statement declaration type */
         if (device_declaration) {
                 if (entry->length < 16)
                         printk(KERN_ERR PREFIX
                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
                             tmp);
                 else if (lsapic->uid == acpi_id)
                         goto found;
         /* Processor statement declaration type */
         } else if (lsapic->processor_id == acpi_id)
                 goto found;
 
         return 0;
 found:
         *apic_id = tmp;
         return 1;
 }
 
 static int map_madt_entry(int type, u32 acpi_id)
 {
         unsigned long madt_end, entry;
         int apic_id = -1;
 
         if (!madt)
                 return apic_id;
 
         entry = (unsigned long)madt;
         madt_end = entry + madt->header.length;
 
         /* Parse all entries looking for a match. */
 
         entry += sizeof(struct acpi_table_madt);
         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
                 struct acpi_subtable_header *header =
                         (struct acpi_subtable_header *)entry;
                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
                         if (map_lapic_id(header, acpi_id, &apic_id))
                                 break;
                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
                                 break;
                 }
                 entry += header->length;
         }
         return apic_id;
 }
 
 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 {
         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
         union acpi_object *obj;
         struct acpi_subtable_header *header;
         int apic_id = -1;
 
         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
                 goto exit;
 
         if (!buffer.length || !buffer.pointer)
                 goto exit;
 
         obj = buffer.pointer;
         if (obj->type != ACPI_TYPE_BUFFER ||
             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
                 goto exit;
         }
 
         header = (struct acpi_subtable_header *)obj->buffer.pointer;
         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
                 map_lapic_id(header, acpi_id, &apic_id);
         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
                 map_lsapic_id(header, type, acpi_id, &apic_id);
         }
 
 exit:
         if (buffer.pointer)
                 kfree(buffer.pointer);
         return apic_id;
 }
 
 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
 {
         int i;
         int apic_id = -1;
 
         apic_id = map_mat_entry(handle, type, acpi_id);
         if (apic_id == -1)
                 apic_id = map_madt_entry(type, acpi_id);
         if (apic_id == -1)
                 return apic_id;
 
         for_each_possible_cpu(i) {
                 if (cpu_physical_id(i) == apic_id)
                         return i;
         }
         return -1;
 }
 #endif
 
 /* --------------------------------------------------------------------------
                                  Driver Interface
    -------------------------------------------------------------------------- */
 
 static int acpi_processor_get_info(struct acpi_device *device)
 {
         acpi_status status = 0;
         union acpi_object object = { 0 };
         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
         struct acpi_processor *pr;
         int cpu_index, device_declaration = 0;
         static int cpu0_initialized;
 
         pr = acpi_driver_data(device);
         if (!pr)
                 return -EINVAL;
 
         if (num_online_cpus() > 1)
                 errata.smp = TRUE;
 
         acpi_processor_errata(pr);
 
         /*
          * Check to see if we have bus mastering arbitration control.  This
          * is required for proper C3 usage (to maintain cache coherency).
          */
         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
                 pr->flags.bm_control = 1;
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Bus mastering arbitration control present\n"));
         } else
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "No bus mastering arbitration control\n"));
 
         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) {
                 /*
                  * Declared with "Device" statement; match _UID.
                  * Note that we don't handle string _UIDs yet.
                  */
                 unsigned long long value;
                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
                                                 NULL, &value);
                 if (ACPI_FAILURE(status)) {
                         printk(KERN_ERR PREFIX
                             "Evaluating processor _UID [%#x]\n", status);
                         return -ENODEV;
                 }
                 device_declaration = 1;
                 pr->acpi_id = value;
         } else {
                 /* Declared with "Processor" statement; match ProcessorID */
                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
                 if (ACPI_FAILURE(status)) {
                         printk(KERN_ERR PREFIX "Evaluating processor object\n");
                         return -ENODEV;
                 }
 
                 /*
                  * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
                  *      >>> 'acpi_get_processor_id(acpi_id, &id)' in
                  *      arch/xxx/acpi.c
                  */
                 pr->acpi_id = object.processor.proc_id;
         }
         cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
 
         /* Handle UP system running SMP kernel, with no LAPIC in MADT */
         if (!cpu0_initialized && (cpu_index == -1) &&
             (num_online_cpus() == 1)) {
                 cpu_index = 0;
         }
 
         cpu0_initialized = 1;
 
         pr->id = cpu_index;
 
         /*
          *  Extra Processor objects may be enumerated on MP systems with
          *  less than the max # of CPUs. They should be ignored _iff
          *  they are physically not present.
          */
         if (pr->id == -1) {
                 if (ACPI_FAILURE
                     (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
                         return -ENODEV;
                 }
         }
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
                           pr->acpi_id));
 
         if (!object.processor.pblk_address)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
         else if (object.processor.pblk_length != 6)
                 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
                             object.processor.pblk_length);
         else {
                 pr->throttling.address = object.processor.pblk_address;
                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
 
                 pr->pblk = object.processor.pblk_address;
 
                 /*
                  * We don't care about error returns - we just try to mark
                  * these reserved so that nobody else is confused into thinking
                  * that this region might be unused..
                  *
                  * (In particular, allocating the IO range for Cardbus)
                  */
                 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
         }
 
         /*
          * If ACPI describes a slot number for this CPU, we can use it
          * ensure we get the right value in the "physical id" field
          * of /proc/cpuinfo
          */
         status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
         if (ACPI_SUCCESS(status))
                 arch_fix_phys_package_id(pr->id, object.integer.value);
 
         return 0;
 }
 
 static DEFINE_PER_CPU(void *, processor_device_array);
 
 static int __cpuinit acpi_processor_start(struct acpi_device *device)
 {
         int result = 0;
         acpi_status status = AE_OK;
         struct acpi_processor *pr;
         struct sys_device *sysdev;
 
         pr = acpi_driver_data(device);
 
         result = acpi_processor_get_info(device);
         if (result) {
                 /* Processor is physically not present */
                 return 0;
         }
 
         BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
 
         /*
          * Buggy BIOS check
          * ACPI id of processors can be reported wrongly by the BIOS.
          * Don't trust it blindly
          */
         if (per_cpu(processor_device_array, pr->id) != NULL &&
             per_cpu(processor_device_array, pr->id) != device) {
                 printk(KERN_WARNING "BIOS reported wrong ACPI id "
                         "for the processor\n");
                 return -ENODEV;
         }
         per_cpu(processor_device_array, pr->id) = device;
 
         per_cpu(processors, pr->id) = pr;
 
         result = acpi_processor_add_fs(device);
         if (result)
                 goto end;
 
         sysdev = get_cpu_sysdev(pr->id);
         if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))
                 return -EFAULT;
 
         status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
                                              acpi_processor_notify, pr);
 
         /* _PDC call should be done before doing anything else (if reqd.). */
         arch_acpi_processor_init_pdc(pr);
         acpi_processor_set_pdc(pr);
 #ifdef CONFIG_CPU_FREQ
         acpi_processor_ppc_has_changed(pr);
 #endif
         acpi_processor_get_throttling_info(pr);
         acpi_processor_get_limit_info(pr);
 
 
         acpi_processor_power_init(pr, device);
 
         pr->cdev = thermal_cooling_device_register("Processor", device,
                                                 &processor_cooling_ops);
         if (IS_ERR(pr->cdev)) {
                 result = PTR_ERR(pr->cdev);
                 goto end;
         }
 
         dev_info(&device->dev, "registered as cooling_device%d\n",
                  pr->cdev->id);
 
         result = sysfs_create_link(&device->dev.kobj,
                                    &pr->cdev->device.kobj,
                                    "thermal_cooling");
         if (result)
                 printk(KERN_ERR PREFIX "Create sysfs link\n");
         result = sysfs_create_link(&pr->cdev->device.kobj,
                                    &device->dev.kobj,
                                    "device");
         if (result)
                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 
         if (pr->flags.throttling) {
                 printk(KERN_INFO PREFIX "%s [%s] (supports",
                        acpi_device_name(device), acpi_device_bid(device));
                 printk(" %d throttling states", pr->throttling.state_count);
                 printk(")\n");
         }
 
       end:
 
         return result;
 }
 
 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 {
         struct acpi_processor *pr = data;
         struct acpi_device *device = NULL;
         int saved;
 
         if (!pr)
                 return;
 
         if (acpi_bus_get_device(pr->handle, &device))
                 return;
 
         switch (event) {
         case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
                 saved = pr->performance_platform_limit;
                 acpi_processor_ppc_has_changed(pr);
                 if (saved == pr->performance_platform_limit)
                         break;
                 acpi_bus_generate_proc_event(device, event,
                                         pr->performance_platform_limit);
                 acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                   dev_name(&device->dev), event,
                                                   pr->performance_platform_limit);
                 break;
         case ACPI_PROCESSOR_NOTIFY_POWER:
                 acpi_processor_cst_has_changed(pr);
                 acpi_bus_generate_proc_event(device, event, 0);
                 acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                   dev_name(&device->dev), event, 0);
                 break;
         case ACPI_PROCESSOR_NOTIFY_THROTTLING:
                 acpi_processor_tstate_has_changed(pr);
                 acpi_bus_generate_proc_event(device, event, 0);
                 acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                   dev_name(&device->dev), event, 0);
         default:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Unsupported event [0x%x]\n", event));
                 break;
         }
 
         return;
 }
 
 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
                 unsigned long action, void *hcpu)
 {
         unsigned int cpu = (unsigned long)hcpu;
         struct acpi_processor *pr = per_cpu(processors, cpu);
 
         if (action == CPU_ONLINE && pr) {
                 acpi_processor_ppc_has_changed(pr);
                 acpi_processor_cst_has_changed(pr);
                 acpi_processor_tstate_has_changed(pr);
         }
         return NOTIFY_OK;
 }
 
 static struct notifier_block acpi_cpu_notifier =
 {
             .notifier_call = acpi_cpu_soft_notify,
 };
 
 static int acpi_processor_add(struct acpi_device *device)
 {
         struct acpi_processor *pr = NULL;
 
 
         if (!device)
                 return -EINVAL;
 
         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
         if (!pr)
                 return -ENOMEM;
 
         pr->handle = device->handle;
         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
         device->driver_data = pr;
 
         return 0;
 }
 
 static int acpi_processor_remove(struct acpi_device *device, int type)
 {
         acpi_status status = AE_OK;
         struct acpi_processor *pr = NULL;
 
 
         if (!device || !acpi_driver_data(device))
                 return -EINVAL;
 
         pr = acpi_driver_data(device);
 
         if (pr->id >= nr_cpu_ids) {
                 kfree(pr);
                 return 0;
         }
 
         if (type == ACPI_BUS_REMOVAL_EJECT) {
                 if (acpi_processor_handle_eject(pr))
                         return -EINVAL;
         }
 
         acpi_processor_power_exit(pr, device);
 
         status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
                                             acpi_processor_notify);
 
         sysfs_remove_link(&device->dev.kobj, "sysdev");
 
         acpi_processor_remove_fs(device);
 
         if (pr->cdev) {
                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
                 sysfs_remove_link(&pr->cdev->device.kobj, "device");
                 thermal_cooling_device_unregister(pr->cdev);
                 pr->cdev = NULL;
         }
 
         per_cpu(processors, pr->id) = NULL;
         per_cpu(processor_device_array, pr->id) = NULL;
         kfree(pr);
 
         return 0;
 }
 
 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 /****************************************************************************
  *         Acpi processor hotplug support                                                    *
  ****************************************************************************/
 
 static int is_processor_present(acpi_handle handle)
 {
         acpi_status status;
         unsigned long long sta = 0;
 
 
         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 
         if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
                 return 1;
 
         /*
          * _STA is mandatory for a processor that supports hot plug
          */
         if (status == AE_NOT_FOUND)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                 "Processor does not support hot plug\n"));
         else
                 ACPI_EXCEPTION((AE_INFO, status,
                                 "Processor Device is not present"));
         return 0;
 }
 
 static
 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 {
         acpi_handle phandle;
         struct acpi_device *pdev;
         struct acpi_processor *pr;
 
 
         if (acpi_get_parent(handle, &phandle)) {
                 return -ENODEV;
         }
 
         if (acpi_bus_get_device(phandle, &pdev)) {
                 return -ENODEV;
         }
 
         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
                 return -ENODEV;
         }
 
         acpi_bus_start(*device);
 
         pr = acpi_driver_data(*device);
         if (!pr)
                 return -ENODEV;
 
         if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
                 kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
         }
         return 0;
 }
 
 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
                                                 u32 event, void *data)
 {
         struct acpi_processor *pr;
         struct acpi_device *device = NULL;
         int result;
 
 
         switch (event) {
         case ACPI_NOTIFY_BUS_CHECK:
         case ACPI_NOTIFY_DEVICE_CHECK:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                 "Processor driver received %s event\n",
                        (event == ACPI_NOTIFY_BUS_CHECK) ?
                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
 
                 if (!is_processor_present(handle))
                         break;
 
                 if (acpi_bus_get_device(handle, &device)) {
                         result = acpi_processor_device_add(handle, &device);
                         if (result)
                                 printk(KERN_ERR PREFIX
                                             "Unable to add the device\n");
                         break;
                 }
 
                 pr = acpi_driver_data(device);
                 if (!pr) {
                         printk(KERN_ERR PREFIX "Driver data is NULL\n");
                         break;
                 }
 
                 if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
                         break;
                 }
 
                 result = acpi_processor_start(device);
                 if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
                         kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
                 } else {
                         printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
                                     acpi_device_bid(device));
                 }
                 break;
         case ACPI_NOTIFY_EJECT_REQUEST:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
 
                 if (acpi_bus_get_device(handle, &device)) {
                         printk(KERN_ERR PREFIX
                                     "Device don't exist, dropping EJECT\n");
                         break;
                 }
                 pr = acpi_driver_data(device);
                 if (!pr) {
                         printk(KERN_ERR PREFIX
                                     "Driver data is NULL, dropping EJECT\n");
                        return;
                }

                if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
                        kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
                break;
        default:
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "Unsupported event [0x%x]\n", event));
                break;
        }

        return;
}

static acpi_status
processor_walk_namespace_cb(acpi_handle handle,
                            u32 lvl, void *context, void **rv)
{
        acpi_status status;
        int *action = context;
        acpi_object_type type = 0;

        status = acpi_get_type(handle, &type);
        if (ACPI_FAILURE(status))
                return (AE_OK);

        if (type != ACPI_TYPE_PROCESSOR)
                return (AE_OK);

        switch (*action) {
        case INSTALL_NOTIFY_HANDLER:
                acpi_install_notify_handler(handle,
                                            ACPI_SYSTEM_NOTIFY,
                                            acpi_processor_hotplug_notify,
                                            NULL);
                break;
        case UNINSTALL_NOTIFY_HANDLER:
                acpi_remove_notify_handler(handle,
                                           ACPI_SYSTEM_NOTIFY,
                                           acpi_processor_hotplug_notify);
                break;
        default:
                break;
        }

        return (AE_OK);
}

static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
{

        if (!is_processor_present(handle)) {
                return AE_ERROR;
        }

        if (acpi_map_lsapic(handle, p_cpu))
                return AE_ERROR;

        if (arch_register_cpu(*p_cpu)) {
                acpi_unmap_lsapic(*p_cpu);
                return AE_ERROR;
        }

        return AE_OK;
}

static int acpi_processor_handle_eject(struct acpi_processor *pr)
{
        if (cpu_online(pr->id))
                cpu_down(pr->id);

        arch_unregister_cpu(pr->id);
        acpi_unmap_lsapic(pr->id);
        return (0);
}
#else
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
{
        return AE_ERROR;
}
static int acpi_processor_handle_eject(struct acpi_processor *pr)
{
        return (-EINVAL);
}
#endif

static
void acpi_processor_install_hotplug_notify(void)
{
#ifdef CONFIG_ACPI_HOTPLUG_CPU
        int action = INSTALL_NOTIFY_HANDLER;
        acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
                            ACPI_ROOT_OBJECT,
                            ACPI_UINT32_MAX,
                            processor_walk_namespace_cb, &action, NULL);
#endif
        register_hotcpu_notifier(&acpi_cpu_notifier);
}

static
void acpi_processor_uninstall_hotplug_notify(void)
{
#ifdef CONFIG_ACPI_HOTPLUG_CPU
        int action = UNINSTALL_NOTIFY_HANDLER;
        acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
                            ACPI_ROOT_OBJECT,
                            ACPI_UINT32_MAX,
                            processor_walk_namespace_cb, &action, NULL);
#endif
        unregister_hotcpu_notifier(&acpi_cpu_notifier);
}

/*
 * We keep the driver loaded even when ACPI is not running.
 * This is needed for the powernow-k8 driver, that works even without
 * ACPI, but needs symbols from this driver
 */

static int __init acpi_processor_init(void)
{
        int result = 0;

        memset(&errata, 0, sizeof(errata));

#ifdef CONFIG_SMP
        if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
                                (struct acpi_table_header **)&madt)))
                madt = NULL;
#endif

        acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
        if (!acpi_processor_dir)
                return -ENOMEM;
        acpi_processor_dir->owner = THIS_MODULE;

        /*
         * Check whether the system is DMI table. If yes, OSPM
         * should not use mwait for CPU-states.
         */
        dmi_check_system(processor_idle_dmi_table);
        result = cpuidle_register_driver(&acpi_idle_driver);
        if (result < 0)
                goto out_proc;

        result = acpi_bus_register_driver(&acpi_processor_driver);
        if (result < 0)
                goto out_cpuidle;

        acpi_processor_install_hotplug_notify();

        acpi_thermal_cpufreq_init();

        acpi_processor_ppc_init();

        acpi_processor_throttling_init();

        return 0;

out_cpuidle:
        cpuidle_unregister_driver(&acpi_idle_driver);

out_proc:
        remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);

        return result;
}

static void __exit acpi_processor_exit(void)
{
        acpi_processor_ppc_exit();

        acpi_thermal_cpufreq_exit();

        acpi_processor_uninstall_hotplug_notify();

        acpi_bus_unregister_driver(&acpi_processor_driver);

        cpuidle_unregister_driver(&acpi_idle_driver);

        remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);

        return;
}

module_init(acpi_processor_init);
module_exit(acpi_processor_exit);

EXPORT_SYMBOL(acpi_processor_set_thermal_limit);

MODULE_ALIAS("processor");